?? semaphores.cpp
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#include <QtCore>#include <cstdlib>#include <iostream>using namespace std;const int DataSize = 100000;const int BufferSize = 4096;char buffer[BufferSize];QSemaphore freeSpace(BufferSize);QSemaphore usedSpace(0);class Producer : public QThread{public: void run();};void Producer::run(){ for (int i = 0; i < DataSize; ++i) { freeSpace.acquire(); buffer[i % BufferSize] = "ACGT"[uint(rand()) % 4]; usedSpace.release(); }}class Consumer : public QThread{public: void run();};void Consumer::run(){ for (int i = 0; i < DataSize; ++i) { usedSpace.acquire(); cerr << buffer[i % BufferSize]; freeSpace.release(); } cerr << endl;}int main(){ Producer producer; Consumer consumer; producer.start(); consumer.start(); producer.wait(); consumer.wait(); return 0;}?? 快捷鍵說明
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